Tethys Picture

In Greek mythology, Tethys, daughter of Uranus and Gaia, was an archaic Titaness and aquatic sea goddess, invoked in classical Greek poetry, but not venerated in cult. Tethys was both sister and wife of Oceanus. She was mother of the chief rivers of the world known to the Greeks, such as the Nile, the Alpheus, the Maeander, and about three thousand daughters called the Oceanids. Considered as an embodiment of the waters of the world she also may be seen as a counterpart of Thalassa, the embodiment of the sea. During the war against the Titans, Tethys raised and educated Hera as her step-child, who was brought to her by Rhea, but there are no records of active cults for Tethys in historic times.
Tethys has sometimes been confused with another sea goddess who became the sea-nymph Thetis, the wife of Peleus and mother of Achilles during Classical times. Some myths imply a second generation relationship between the two, a grandmother and granddaughter.
[From Wikipedia].

In reality it's likely that Tethys and Thetis are both derived from the same sea goddess, worshiped in prehistoric times. Think about that in my language, italian, they have exactly the same name (Teti).

Made with Azalea's Dress up Dolls - Goddess Maker
Theoi Protogenoi
SSU Bios: Protogenoi
RoM: Myrna Thalass
Lies' Labyrinth: Map Of Olympus